Chemical fire-extinguisher.



-. UNIT-ED AS MAX BRESIJAUER, OF GHARILOTTEN'BURG, GERMANY, ASSIGNOR 'ro'rnn FIRM OF w. eRAAFF & COMPAGN'IE, ens. MIT BESCHR. HAFTUNG, F BERLIN, GERMANY.

QEEMIG AL FIRE-EXTING'UISHER.

To all whom it may concern."

Be it known that 1, MAX BRESLAUER, city chemist and a doctor of philoso hy, a subject of the German Emperor, an residing at fore em loyed tartaric acid, sulfuric acid or 29 Kleiststrasse, in the city of Charlottenburg, near Berlin, Kingdom of Prussia, and German Empire, have invented a certain new and useful Chemical Fire-Extinguisher, of which the following is a specification.

In the chemical fire-extinguishers hereto-.

hydroc oric acid have been used as the acid principle which causes the evolution of caronic acid and the gas pressure incident thereon for the purpose of effecting the sprinkling, m consequence of the acid acting upon the soda-solution. The employment essary to make use of unreasonabl acid tubes for producing the desire I the purpose 0? these acids was ,accom anied by various inconveniences. In the st place tartaric acid and hydrochloric acid exert comparatively too feeble anaction, so that it was neceffect and in comparison with the given capacity of the. fire-extinguisher; and on the other hand sulfuric acid which on account of'its cheapness is used with preference, possesses a too strong and sometimes rather explosive action causing danger of bursting the a paratus, without itbemg possible to utilize thehigh pressure enerated with advantage for a uniform sprinkling of the fire-extinguishing solution. In this connection it has been found byexperience when making use of sulfuric acid, thatthe jet forcedout from the ap aratus is lacking con-- tinuity and particular y in the beginning of the gas-liberating process which is accompanied by the generation of considerable eat of reaction, the jet being thrown around in form of detached pieces to irregular dis-.

'tances and-that, generally s eaking it is not possible to obtain any relia 1e action on account of the "considerable decrease of pressure durin the sprinkling operation. Nor

is it possib e to obtain any better results by Specification of Letters Patent. Application filed Ma 3,1906. Serial N o. 2 95.206.

large Patented Jan. 14, 1908.

I tioned for employment in fire-extinguishers,

which substitute before all should have the effect that the pressure of the gas and ofthe CBII'bOIIlC acid thou h exertin 81' vi'orous I motive power imme iately upon its reacting with the soda solution, yet does not cause the tearing apart of the ejected jet of the fire extinguishing agent, but that on the contrary an enduring sprinkling with continuous jetis caused, the jet showin no essential decrease of its length of throw uring the emptying of the-apparatus.

The invention resides in the fact of employing hos horic acid in more or less concentrate so utiori for the charging of the acid tubes in fire-extinguishers in place of other acids. The acid tubes are manufactured from glass in the Well-known manner and after having been filled with the acid agent, they are sealed up by fusingthe open-- ing together and they are then placed within a solution of acid carbonate of soda, which is the li uid commonly employed for the charging 0 fire extinguishers, the arrangement of the tubes being such, as to enable them-to be broken by means anisms.

of-suitableactuating mech- The advantages which are realized-by the use of phosphoric acid according to the invention, are the following: In the firstplace itshould be noted, that even the concentrated solution of phosphoric acid is a comparatively innocuous acid, which does not produce any caustic action or stains that cannot be removed, upon the skin or u on the clothes,- as sulfuric acid and by 0- chloric acid, in case the tube is broken by inadvert'ence before it is mounted in the aparatus. 'In view of'the phosphoric acld eing very diflicultly volatile, the sealing up by fusion of the glass tubes filled with the acid is not accompanied by the 'inconvene iences which arise from the generation of suffocating vapors and gases when seahng up tubes containing sulfuric acid or hydrochloric acid. r

As regards the efficiency of the acid calculated on the basis of equal volumes, even a somewhat smaller quantityof the solution of phosphoric acid will be'suflicient under the same conditions as compared with sul- 'furic acid; and as compared with {hydrochloric acid, it is only necessary to employ a one third of the same quantity of phosphoric acid solution. I Owing to this fact the tubes in space adds to the small weight and to the larger capacity of the apparatus.

It has been found by experiments that, when using tubes filled with phos horic acid in chemical fire-extinguishers o the wellknown so-called Minimax-type, the efficiency is exceedingly favorable. The jet was thrown to a distance of about 49 feet- (as compared with 39 feet in the case of the use of ydrochloric acid) and was maintained in its continuity from the start and it remained under substantially uniform ejectmg pressure until the fireeextinguisher was emptied. This novel effect cannot'be attained either with hydrochloric acid or with 1 sulfuric acid, no matter whether these acids are concentrated or dilute. The reason for this effect is probably to be attributed to quenchin g 'ters Patent of the United States is the fact of the phosphoric. acid being capable of setting up a continuously progressing re action in the mass of soda-solution without excessive heat of reaction under the conditions prevailing in the fire extinguishing apparatus. I

Ihe incrustating action, which the mixture ejected by the jet, exercises upon the objects struck by the jet with a view of the flames and the coniiagration, is considerably increased on account of the formation of phosphate of soda and in some,

casesof pyro-phosphate of soda even.

What 1 claim and desire to secure by Let Chemical fire-extinguisher, in which the filling of the acid-container consists of a solution of phosphoric acid.

In witness whereof I have hereunto signed my name this-27th day of December, 1905, in the presence of two subscribing witnesses.

MAX BRESLAUER. .VVitnesses HENRY HAsPEn, WOLDEMAR HAUPT. 

